Choose the hazard target
The current Vanguard microbiology menu includes Salmonella, Listeria monocytogenes and pathogenic E. coli testing, among other organisms. A request should state the target explicitly rather than ask for an undefined complete pathogen screen.
Describe the food and the decision
Include the food type, whether it is raw or ready to eat, the processing stage and the lot. State whether testing supports routine verification, supplier qualification or an investigation.
Agree sample portions
The number of units, portion tested and any compositing plan affect what a result represents. Define those points before collection. Do not combine samples solely to reduce shipping volume.
Plan follow-up before testing
A detected result needs a defined communication and response path within the customer’s food-safety program. A not-detected result does not establish that every unit is free of the organism.
Related testing & guidance
Technical & service references
Vanguard microbiology service menuFDA: Bacteriological Analytical ManualUSP: General Chapter <61>Source review: November 8, 2026. The agreed method and project scope govern the testing.